Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c41685970230c9b2f3c87691074f4e9ba0429e14f540e88fa36ba879621b34' 
  AND token = '+v+LDmhtm4G963679d1tDtk+SkmuKs/QRrVwImdRtFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}